The investigation

So far, the massacre has no known link to overseas terrorism or terror groups, a US official with knowledge of the case said.

And a woman described as a “person of interest” after the attack is not believed to be involved in the shooting, police said in a statement.

“Marilou Danley is no longer being sought out as a person of interest,” the Las Vegas Metropolitan Police Department said. “LVMPD detectives have made contact with her and do not believe she is involved with the shooting on the strip.”

Blood donations needed

With hundreds of victims still hospitalized, officials feared the death toll will keep rising.

The sheriff implored the community to donate blood. And before dawn, throngs of donors had already lined up outside a blood bank.

Shanda Maloney tweeted a photo while she stood in line at 4:30 a.m.

“This. Is. Vegas. This is our community. These are our people. Thank you to everyone here donating,” she tweeted.

Maloney told CNN she also gave transportation to anyone who needed it after the attack.

“I just started picking people up and giving people rides,” she says.

Aldean speaks out

Aldean posted a statement on Instagram saying that he and his crew were safe.

“My Thoughts and prayers go out to everyone involved tonight. It hurts my heart that this would happen to anyone who was just coming out to enjoy what should have been a fun night. #heartbroken#stopthehate,” he wrote.

Two Las Vegas police officers are being treated at a local hospital for injuries they sustained during the shooting, Lombardo said. One is in critical condition, and the other sustained minor injuries.

In addition, the sheriff stated that there were off-duty officers attending the concert who may have died. The identities of those officers have not been released.

“Pray for Las Vegas,” the city’s mayor, Carolyn Goodman, tweeted. “Thank you to all our first responders out there now.”

Nevada Gov. Brian Sandoval said on Twitter that a “tragic & heinous act of violence has shaken the #Nevada family” and offered prayers to all those affected by “this act of cowardice.”

A tragic & heinous act of violence has shaken the #Nevada family. Our prayers are w/ the victims & all affected by this act of cowardice.

De Kerf’s sister, Monique Dumas, said that everyone instantly crouched when they heard the shots.

“The band was rushed off the stage, the floodlights came on the crowd, and you see on the right hand of the stage the person who was injured, so they’re calling for medics, calling for security, then there was gunfire again,” Dumas said.

‘Go, go, go’

SiriusXM Country radio host Storme Warren was on the side of the stage as Aldean was performing when the shots rang out.

“I thought it was fireworks going off and maybe it mistriggered, and then it happened again. And when it happened the third time, we knew something was wrong,” Warren said.

“The shells were hitting the deck of the stage when I was on it,” he said, adding that he could still hear the shells as he went under the stage for protection.

“It seemed there was a pause in the gunfire and the people in the yellow shirts were telling the people to ‘go, go, go, go’ … the gunfire never ended, it seemed like it went on and on and on,” Dumas said.

A concertgoer told CNN affiliate KLAS that everybody was lying on top of each other trying to get out of the shooter’s way.

“My husband and I ran out toward our car, and there were people hiding underneath my car for cover,” she said.

“There was a gentleman who was shot and he said, ‘Can you help me?’ And so I put him in my car and I had like six people in my car, people without shoes, running, just to get away.”

‘Like shooting fish in a barrel’

Audio of the shooting suggested that the shooter had used a military-style weapon, CNN law enforcement analyst James Gagliano said.

“Automatic weapon(s) like that — had to be numbers of magazines or a very large drum, it sounded to me like a belt-fed weapon, a military-style weapon and then to be shooting down, to use the analogy, it was like shooting fish in a barrel in that space,” Gagliano said.

MGM Resorts, which owns the Mandalay Bay, tweeted its condolences.

“Law enforcement and emergency personnel responded quickly to the incident a secured the scene,” it said in a statement. “Law enforcement requested that we put hotels in the vicinity on lockdown to ensure guest safety. We will provide more information as it becomes available.”